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Muon Collider Design Workshop - Summary

The annual Muon Collider Design Workshop brings together groups working on Muon Collider designs to review concepts, simulations, and experiments. The goal is to focus future efforts towards a baseline collider scenario. Topics include proton drivers, muon cooling, acceleration schemes, and more.

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Muon Collider Design Workshop - Summary

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  1. Muon Collider Design Workshop - Summary Alex Bogacz

  2. Motivation & Goals The annual Muon Collider Design Workshop (previously hosted at BNL) is aimed at bringing together all the groups working on various designs for Muon Colliders. The goal is to review and assess the current state of the concepts, simulation work and experiments. We shall examine practical limits on the performance of required technologies in attempt to focus future efforts towards a baseline collider scenario. The workshops will cover topics such as: • Proton drivers • Muon cooling and demonstration experiments • Bunch recombination • Muon acceleration schemes • Collider Ring and Interaction region design • Site boundary radiation • Detector concepts for energy frontier NFMCC Collaboration Meeting, LBNL, January 27, 2009

  3. Program - Sessions COLLIDER SCENARIOS PROTON DRIVER & RF COOLING SIMULATIONS FINAL COOLING ACCELERATION INTERACTION REGION EXPERIMENTS & PLANS SUMMARIES NFMCC Collaboration Meeting, LBNL, January 27, 2009

  4. Participants NFMCC Collaboration Meeting, LBNL, January 27, 2009

  5. LEMC Scenario Rol Johnson

  6. bunch coalescing new Fernow or PIC 201 MHz FOFO snake Medium Emittance scheme of 2007 Yuri Alexahin • Bob Palmer found a number of weak points with this scheme: • bunch length grows >1m during REMEX in 50T solenoids  bunch frequency of 200MHz can not be sustained  merging should be done before REMEX with all the losses due to merging and recooling; • “super-Fernow” (aka bucked coil) lattice has poor transmission (<50%) making the overall survival a dismal 4% (if Guggenheims are used for 6D cooling). • Still I think that the idea is not hopeless, though modifications are necessary

  7. Parameters of Different MC options Low Emit. High Emit. MCTF07 MCTF08 s (TeV) 1.5 Av. Luminosity (1034/cm2/s) * 2.7 1 1.33-2 Av. Bending field (T) 10 6 6 Mean radius (m) 361.4 500 500  495 No. of IPs 4 2 2 Proton Driver Rep Rate (Hz) 65 13 40-60 Beam-beam parameter/IP 0.052 0.087 0.1 * (cm) 0.5 1 1 Bunch length (cm) 0.5 1 1 No. bunches / beam 10 1 1 No. muons/bunch (1011) 1 20 11.3 Norm. Trans. Emit. (m) 2.1 25 12.3 Energy spread (%) 1 0.1 0.2 Norm. long. Emit. (m) 0.35 0.07 0.14 Total RF voltage (GV) at 800MHz 407103c 0.21** 0.84**  0.3† Muon survival N/N0 0.31 0.07 0.2 ? + in collision / proton 0.047 0.01 0.03 ? 8 GeV proton beam power 3.62*** 3.2 1.9-2.8 ? ---------------------------------------------------------------------------

  8. HEMC Scenario Bob Palmer

  9. HEMC Scenario

  10. Proton Driver

  11. Scott Berg

  12. Scott Berg

  13. Valeri Lebedev

  14. Big View of Muon Cooling….

  15. Front End Capture/Phase Rotation & Cooling Studies Dave Neuffer s = 1m s = 89m Drift and Bunch Rotate 500 MeV/c s = 219m s = 125m Cool 0 30m -30m

  16. Front end simulations Initial beam is 8GeV protons, 1ns bunch length Dave Neuffer

  17. Overview of Cooling Studies in the UK Chris Rogers

  18. 3 B 1 2 6 3 5 4 Helical FOFO Snake Simulations Create rotating B field by tilting (or displacing) solenoids in rotating planes x*cos(k)+y*sin(k)=0, k=1,2,… Example for 6-cell period: Solenoid # 1 2 3 4 5 6 Polarity + - + - + - Roll angle k 0 2/3 4 /3 0 2 /3 4 /3 Yuri Alexahin Channel parameters: 200 MHz pillbox RF 2x36cm, Emax=16MV/m Solenoids: L=24cm, Rin=60cm, Rout=92cm, Absorbers: LH2, total width (on-axis) 6x15cm, Total length of 6-cell period 6.12m

  19. 6 Phase space distributions px py p blue - initial, red - final z-v0*t x y “Emittances” (cm) initial final 6D 10.3 0.07 Trans. average 1.99 0.29 Longitudinal 3.75 1.46 Why momentum acceptance is so large (>60%) in the resonance case? Nice surprise: Large 2nd order chromaticity due to nonlinear field components keeps both tunes from crossing the integer ! MCTF Scenario Update - Y. Alexahin 2nd MCD workshop, JLab, December 10, 2008

  20. Study of Ring Coolers for + - Colliders David Cline

  21. Lithium Lens for Muon Final Cooling Initial Design of Liquid Li Lens Kevin Lee Lens assembly w/ current discs and the primary and secondary coils Li D = 2.54 cm; L = 30.0 cm

  22. Progress on Guggenheim RFOFO - Simulations liquid H2 RF solenoid Pavel Snopok

  23. Progress on Design of Helical Cooling Channel Katsuya Yonehara Milorad Popovic

  24. Epicyclic Helical Solenoid Superimposed transverse magnetic fields with two spatial periods Variable dispersion function XY-plane Andrei Afanasev k1=-2k2 B1=2B2 EXAMPLE

  25. θ2 r2 θ1 r1 rmax rave rmin Bz = 2 T Bz = -0.5 T Simulations of Muon Cooling With an Inverse Cyclotron R. Palmer’s ICOOL model Terry Hart G4beamline model VORPAL 3D Simulations with space-charge Kevin Paul

  26. Frictional Cooling Tom Roberts 10 m Solenoid 1,400 thin carbon foils (25 nm), separated by 0.5 cm and 2.4 kV. μ− climb the potential, turn around, and come back out via the frictional channel. … μ− In(3-7 MeV) 20cm μ− Out(6 keV) -5.5 MV Gnd Resistor Divider HV Insulation First foil is at -2 MV, so outgoing μ− exit with 2 MeV kinetic energy. Solenoid maintains transverse focusing. Device is cylindrically symmetric (except divider); diagram is not to scale. Remember that 1/e transverse cooling occurs by losing andre-gaining the particle energy. That occurs every 2 or 3 foilsin the frictional channel.

  27. The MANX Proposal DRAFT MANX following MICE at RAL DRAFT Robert Abrams1, Mohammad Alsharo’a1, Charles Ankenbrandt1, Emanuela Barzi2, Kevin Beard1, Alex Bogacz3, Daniel Broemmelsiek2, Yu-Chiu Chao3, Mary Anne Cummings1, Yaroslav Derbenev3, Henry Frisch4, Ivan Gonin2, Gail Hanson5, David Hedin7, Martin Hu2, Rolland Johnson1, Stephen Kahn1, Daniel Kaplan6, Vladimir Kashikhin2, Moyses Kuchnir1, Michael Lamm2, Valeri Lebedev2, David Neuffer2, Milord Popovic2, Robert Rimmer3, Thomas Roberts1, Richard Sah1, Linda Spentzouris6, Alvin Tollestrup2, Daniele Turrioni2, Victor Yarba2, Katsuya Yonehara2, Cary Yoshikawa2, Alexander Zlobin2 1Muons, Inc. 2Fermi National Accelerator Laboratory 3Thomas Jefferson National Accelerator Facility 4University of Chicago 5University of California at Riverside 6Illinois Institute of Technology 7Northern Illinois University

  28. If MANX isn’t a prototype for NF or MC cooling, could it be? Rol Johnson For example, if HPRF can’t be made to work, then you could match 6d MANX output to ~150 MeV vacuum RF section, (a la Fernow) accelerate 150 MeV, which would improve 6d emittance by factor of ~5. Inject into another MANX section, and iterate 9 times to reduce 6d emittance by a factor of a million in 10X30 = 300 m.

  29. MANX w/Matching Off-Axis MANX MICE Phases + MANX MANX in MICE (Conceptual)

  30. MANX Objectives • Measure 6D cooling in a channel long enough for significant reduction of emittance • Study the evolution of the emittance along the channel by making measurements inside the channel as well as before and after • Test the Derbenev-Johnson theory of the HCC • Advance muon cooling technology Much discussion!

  31. Further Cooling Experiments Chris Rogers

  32. Study high pressure hydrogen gas filled RF cell Katsuya Yonehara

  33. Don Summers Rapid Cycling Synchrotron

  34. Prototype Arc design NS-FFAG NS-FFAG (Non-Scaling Fixed Field Alternating Gradient) • ‘Racetrack’ RLA to accommodate large momentum range (~60%) Dejan Trbojevic • Large energy acceptance • Very small orbit offsets • Reduce number of arcs • Very compact structure Basic cell structure in ARC (combined function magnet with extremely strong focusing ) Reference: Flexible Momentum Compaction Return Arcs for RLAs, D. Trbojevic, R.P. Johnson, EPAC, 2578-2580 MCDW 2008, JLAB, Dec 8-12, 2008

  35. NS-FFAG multi-pass ‘Droplet’ Arc 3000 inward 600 outward 600 outward , Guimei Wang MCDW 2008, JLAB, Dec 8-12, 2008

  36. x y Dx DDx/50 Wx Wy IR Optics Yuri Alexahin “Dipole first” modified Oide

  37.  CSIy [m]  CSIx [m] Nonlinear Detuning and Dynamic Aperture Eliana Gianfelice “Dipole first” modified Oide Normalized anharmonicities: dQ1/dE1 = 0.25242152E+08 dQ1/dE2 = 0.19616977E+08 dQ2/dE2 = 0.18515914E+08

  38. Status of the Collider-IR design Yuri Alexahin With the present level of understanding it seems possible:  = 1cm c ~ 10-5- 10-4 momentum acceptance ±1% Dynamic aperture ~ 5 for N = 25 m (HE option) Circumference ~ 3km (all at the same time) To proceed further to a realistic design a close collaboration between lattice designers and detector, energy deposition and magnet technology groups is a must.

  39. Muon Collider Detector Revision • Prepare G4Beamline to simulate beam-induced backgrounds in sensor arrays of a large detector in the low-beta region of a muon collider. • Verify the simulations by comparing distributions and rates to other codes, such as MARS, and to analytic calculations. • Consolidate existing NIU and other photon sensor performance data and extend them as needed with new measurements. • Compare the apparent requirements from the preliminary G4beamline simulations for at least one muon collider scenario with the performance data to identify inconsistencies or areas where improvement is needed in the devices, electronics, IP design, or machine parameters. Mary-Anne Cummings

  40. Proton Driver & RF, Acceleration - Discussion Chuck Ankenbrandt How to transform Project X into a Proton Driver? Should linac be CW or pulsed? How many IR’s? How promising are new Induction Accel. ideas? MANX, MICE, & the 5-year plan Will MC be low, med, or high emittance? What were the highlights of this workshop? Questions about particular talks

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